修改socket为keepAlive

 参考文章：http://blog.csdn.net/ctthuangcheng/article/details/8596818

[root@mdw-2 gpadmin]# vi /etc/sysctl.conf

追加添加如下：

net.ipv4.tcp_keepalive_time=90
net.ipv4.tcp_keepalive_intvl=15
net.ipv4.tcp_keepalive_probes=2

使生效：

[root@mdw-2 gpadmin]# sysctl -p
kernel.shmmax = 500000000
kernel.shmmni = 4096
kernel.shmall = 4000000000
kernel.sem = 250 512000 100 2048
kernel.sysrq = 1
kernel.core_uses_pid = 1
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.msgmni = 2048
net.ipv4.tcp_syncookies = 1
net.ipv4.ip_forward = 0
net.ipv4.conf.default.accept_source_route = 0
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_max_syn_backlog = 4096
net.ipv4.conf.all.arp_filter = 1
net.ipv4.ip_local_port_range = 1025 65535
net.core.netdev_max_backlog = 10000
net.core.rmem_max = 2097152
net.core.wmem_max = 2097152
vm.overcommit_memory = 2
net.ipv4.tcp_keepalive_time = 15
net.ipv4.tcp_keepalive_intvl = 1
net.ipv4.tcp_keepalive_probes = 3

查看：

[root@mdw-2 gpadmin]# sysctl -a | grep keepalive
net.ipv4.tcp_keepalive_time = 15
net.ipv4.tcp_keepalive_probes = 3
net.ipv4.tcp_keepalive_intvl = 1